Excitation and entanglement transfer near quantum critical points

Michael J. Hartmann, Moritz E. Reuter, Martin B. Plenio

Research output: Contribution to journalArticle

Abstract

Recently, there has been growing interest in employing condensed matter systems such as quantum spin or harmonic chains as quantum channels for short distance communication. Many properties of such chains are determined by the spectral gap between their ground and excited states. In particular this gap vanishes at critical points of quantum phase transitions. In this article we study the relation between the transfer speed and quality of such a system and the size of its spectral gap. We find that the transfer is almost perfect but slow for large spectral gaps and fast but rather inefficient for small gaps.

Original languageEnglish
Pages (from-to)17-23
Number of pages7
JournalOptics and Spectroscopy
Volume103
Issue number1
DOIs
Publication statusPublished - Jul 2007

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics

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